Seven years after her first Trek performance Dilley was hired to portrayed the RomulanCommanderSela in the Star Trek: The Next Generation episode "The Mind's Eye". For this part she also received no credit as she was only seen as the figure hiding in the shadows. Actress Denise Crosby who played Sela in the following episodes lent her voice for the scene in "The Mind's Eye". Dilley auditioned for this part with 49 other women and finally got the part. Unusuallly she got an acting contract for this role and was called back to work on more episodes of The Next Generation where she portrayed multiple aliens and Starfleet officers. Dilley also worked as additional stand-in and second unit special effects photo double for Gates McFadden's Beverly Crusher when the regulars Lorine Mendell and Cameron were unavailable. A few years earlier her union membership was the reason she was not hired for this part.

Beside her film work, Dilley also worked as a crewmember on the science fiction series V between 1984 and 1985 and on J. Michael Straczynski's science fiction series Babylon 5. On the latter one she can be seen as many different alien characters and also worked as stand-in.